EP0068024B1 - Procede de copolymerisation en vrac continue de monomeres vyniliques - Google Patents

Procede de copolymerisation en vrac continue de monomeres vyniliques Download PDF

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Publication number
EP0068024B1
EP0068024B1 EP82900690A EP82900690A EP0068024B1 EP 0068024 B1 EP0068024 B1 EP 0068024B1 EP 82900690 A EP82900690 A EP 82900690A EP 82900690 A EP82900690 A EP 82900690A EP 0068024 B1 EP0068024 B1 EP 0068024B1
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Prior art keywords
mixture
reaction
monomer
vinylic
monomers
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EP82900690A
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German (de)
English (en)
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EP0068024B2 (fr
EP0068024A1 (fr
Inventor
Archie E. Hamielec
Grant P. Lawless
Harold H. Schultz
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SC Johnson Commercial Markets Inc
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SC Johnson and Son Inc
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F2/00—Processes of polymerisation
    • C08F2/02—Polymerisation in bulk

Definitions

  • This invention relates to a process for bulk copolymerizi l ng vinyl monomers by thermal initiation.
  • it relates to a method for forming low molecular weight polymers of relatively uniform molecular weight by continuous bulk copolymerization.
  • Styrene and acrylic acid copolymers are conveniently identified as (S/AA), of low molecular weight have found wide acceptance in industry.
  • Such copolymers sometimes denominated “solution polymers,” have been employed in inks, floor polishes, paper coatings, paints and adhesives.
  • Typical solution polymers have a number average molecular weight (M n ) from about 2000 to 5000 and a weight average molecular weight (M w ) from about 7000 to 10,000.
  • M n number average molecular weight
  • M w weight average molecular weight
  • low molecular weight solution-type polymers have been produced employing mass polymerization techniques. Typically, by such techniques, vinylic monomers were polymerized in the presence of a solvent and at low temperatures of about 120°C.
  • styrene monomer has been homopolymerized to form high molecular weight polymers from 20,000 to 100,000 1MW) in a continuous mass polymerization process without solvents, catalytic initiators and molecularweight regulators, as disclosed in U.S. Patents 2,496,653 and 3,859,268. It has been generally recognized that at temperatures above about 200°C, thermally initiated styrene polymerization produces products having undesired dimers, trimers and oligomers of wide ranging molecular weight and having a high dispersion index (weight average molecular weight-Mwlnumber average molecular weight-M n ).
  • solution polymers useful in providing an alkali cut on the order of 25 to 35% solids for use in various finishes, polishes and the like or for ink resins have long been desired to produce solution polymers useful in providing an alkali cut on the order of 25 to 35% solids for use in various finishes, polishes and the like or for ink resins.
  • solution polymers at high solids content were unduly viscous and difficult to handle and process. This was due, in part, to their high dispersion index.
  • a product In general, for commercial use in solution polymer applications a product should exhibit a relatively uniform molecular weight, having a dispersion index of less than about 2. Thermally initiated styrene homopolymerization at elevated temperatures has not provided acceptable dispersion indices.
  • a "runaway" reaction at 297°C provided a polystyrene with a polydispersibility of 3.68.
  • Bengouh and Park, European PolymerJournal, Vol. 14, pp. 889-894 (1978) at reactor temperatures of 230°C to 250°C, polydispersity was from 3 to 3.8 after thermal initiated polymerization of styrene monomer.
  • British Patent 859,517 discloses a continuous process for polymerization of vinyl aromatic compounds, however, employs a temperature range of from 180°C to 350°C, thus providing polymers of a molecular weight of between 20,000 and 30,000. Additionally, the reference is absent the dispersion index of the resulting material.
  • the art has long sought a continuous bulk polymerization process capable of selectively producing low molecular weight vinylic copolymers having a lower dispersion index, employing thermal initiation, without the need of a solvent, catalyst or weight retarding agent.
  • vinyl polymer refers to the addition polymer formed by polymerizing vinylic monomers. Typical vinylic monomers include such diverse monomers as a-methyl styrene vinyl toluene, styrene, acrylic or methacrylic acids, acrylic or methacrylic esters and the like. Further, contemporary industry standards require that such a process have sufficient flexibility to selectively increase or decrease the molecular weight of the desired product in accordance with market requirements.
  • a bulk polymerization process for preparing low molecular weight vinylic polymers having a dispersion index less than about 2 and a number average molecular weight from 1000 to 6000 comprises the steps of continuously;
  • a mixture of two or more vinyl type monomers preferably including styrene and an acrylic monomer, are charged continuously into a reactor zone containing molten resin having the same ratio of vinyl monomers as the monomer mixture.
  • the molten resin is maintained at a preset temperature to provide a polymer of the desired molecular weight.
  • Reaction product is pumped out of the reaction zone at the same weight rate as the monomers are charged to provide a fixed level of resin in the system.
  • the molten resin may be subjected to separation means to remove or reduce the content of unreacted monomer and any volatile by-products. Such unreacted monomer may be recovered and reused in the system.
  • a second component of the polymer produced by the present process is an acrylic monomer.
  • nonacrylic ethylenic monomers can be added to the monomer charge, including vinyl esters, such as vinyl acetate and maleic acid.
  • the proportions of such monomers can be varied. In certain instances it may be possible to substitute such monomers for the acrylic monomer.
  • Preferred monomer charges include: the comonomers, styrene and acrylic acid and the termonomers, a-methyl styrene/styrene and acrylic acid.
  • Such charges provide, respectively, a preferred copolymer (S/AA) and a preferred terpolymer (AMS/S/AA) having a low dispersion index; having low residual monomer content and exhibiting a number average molecular weight adapted to be controlled to a narrow predetermined range by presetting the reaction temperature and residence time in accordance with the invention.
  • the preferred monomer charge employs from 60-80% by weight monoalkenyl aromatic monomer and 40-20% by weight of acrylic monomer, such as acrylic acid.
  • monoalkenyl aromatic monomer is styrene or a mixture of styrene and a-methyl styrene in a weight ratio from 2:1 to 1:2. It is particularly preferred to employ 3 parts by weight to 2 parts by weight of styrene solids per part of acrylic acid.
  • reaction temperature is maintained from 235°C to 310°C.
  • the minimum reaction temperature at steady state will vary, depending on the particular monomers charged to the reactor. Generally, it was found that at temperatures below 175°C, the material formed was too viscous to process efficiently.
  • the number average molecular weight may exceed the desired maximum of 6000. Further, the uniformity of the reaction product deteriorates unacceptably. In particular, the dispersion index, an important measure of uniformity, shows that the spectrum of copolymer produced is broadened considerably, when the reaction temperature is maintained below 235°C.
  • reaction temperatures from 245°C to 275°C. Within the preferred temperature range it is possible to achieve the most desirable balance of copolymer properties, such as molecular weight, dispersion index, purity, and ability to form a high solids content, alkali-soluble resin cut.
  • the temperature can have adverse effects on the product.
  • the polymer products tend to be discolored and exhibit undesired yellowing possibly by formation of undesired by-products, including oxidation products.
  • the resulting polymer products may be subject to depolymerization, reversible reactions and other side reactions which yield dimers, trimers and other undesired low molecular weight oligomers.
  • Such by-products contaminate resin cuts of product polymer and contribute to their high optical density. This, in turn, indicates that off-color finishes can be expected employing such resin cuts.
  • reaction time or residence time in the reaction zone is controlled by the rate of flow of constituents through the reaction system.
  • the residence time is inversely proportional to flow rate. It has been found in U.S. 4,117,235 that at a given temperature, the molecular weight of the polymer product decreases as the residence time increases.
  • reaction residence times of at least 2 minutes to provide satisfactory reaction completion. While the residence time in the reaction zone may be as long as 1 1/2 hours, normally discoloring reactions and other side reactions will dictate that shorter residence times be employed. For most cases a residence time of from 5 to 45 minutes, and, preferably, from 10 to 20 minutes is satisfactory. In general, even longer residence times increase the yield of product, but the rate of increase of product is generally very slow after 20 to 30 minutes of reaction.
  • the flow rate of reactants for the preferred styrene/acrylic acid monomer mix is between 2.7 to 13.6 kilograms per hour per liters/3.75 of reactor capacity.
  • the flow rate selected for a particular monomer system will depend upon the reaction temperature, constituents, desired molecular weight, desired dispersion index and the particular system employed.
  • reaction temperature and residence times are mutually manipulated in accordance with the principles provided herein.
  • the reaction pressure in an enclosed system is a function of residual vapor pressure of unreacted monomer and other volatiles present either in the feed, such as water, or in the reaction mix (produced in side reactions).
  • the reaction pressure has no significant effect on the yield and the upper limit is a function of equipment capability, while the lower limit is a function of feed rate and monomer composition.
  • the higher gas pressures which result may require special equipment and procedures for safe handling.
  • a solvent capable of forming a reaction product with the copolymer, is incorporated in the mixture of vinylic monomers.
  • the solvents act to reduce the viscosity of the product.
  • the solvent also acts to lower the viscosity of the alkali cut of the copolymer at high solids contents from 25 to 35% non-volatiles. It has been found that a portion of the solvent is strongly associated (by reaction or binding) with the copolymer, while the remaining portion is loosely associated with the copolymer.
  • the solvents employed include polyalkoxy mon-alkanols.
  • polyethers are well known to the art.
  • Typical examples include the family of solvents derived from 2-ethoxyethanol, known to the art as Cellosolve.
  • Illustrative solvents are butyl Cellosolve and Cellosolve acetate.
  • a particularly preferred solvent is diethylene glycol monoethyl ether, known industrially as Carbitol.
  • Other useful solvents include ethylene glycol monomethyl ether and di-ethylene glycol monomethyl ether.
  • MIBK methyl isobutyl ketone
  • ethylene, propylene or diethylene glycol are employed as the solvent or part of the solvent, the molecular weight distribution will be widened or gelation can occur depending on the level of the dihydric alcohol and the degree of cross-linking which occurs.
  • the process of the present invention involves the use of a variable fillage type stirred reactor for the polymerization of vinylic monomers to copolymers having a narrow-molecular weight distribution by the proper balancing of the conditions of polymerization and flow rates.
  • the reaction zone as represented by reactor 10 can comprise a continuous stirred tank reactor of any type adapted for variable fillage operation of from as low as 10% to 100% of the usable volume thereof for the production of vinylic polymers.
  • This continuous stirred tank reactor may be either horizontal or vertical and should have provision for close control of the temperature therein by any desired means, including control by cooling jacket, internal cooling coils or by withdrawal of vaporized monomer followed by condensation thereof and return of the condensed monomer to the reaction zone.
  • this reaction zone can, if desired, be constituted by a plurality of continuous stirred tank reactors operated in series. Likewise, it will be apparent that such reaction zone can comprise more than one continuous stirred tank reactor operated in parallel if it is desired to employ several relatively small reactors to supply the capacity of the final reaction zone rather than a single large reactor for that purpose.
  • a preferred form of continuous stirred reactor which has been found quite suitable for carrying out the process is that general type illustrated in the accompanying drawing wherein a tank reactor is provided with cooling coils sufficient to remove any heat of polymerization not taken up by raising the temperature of the continuously charged monomer composition so as to maintain a preselected desired temperature for polymerization therein.
  • a tank reactor is provided with cooling coils sufficient to remove any heat of polymerization not taken up by raising the temperature of the continuously charged monomer composition so as to maintain a preselected desired temperature for polymerization therein.
  • a continuously stirred tank reactor will be provided with at least one and usually more vaned agitators driven by an external power source such as a motor. At least one such agitator is positioned to provide agitation of liquid contained in the reactor while operating at minimum fillage, i.e., as low as 10% of the volume thereof.
  • Such a continuous stirred tank reactor can, if desired, be provided with additional features for improved efficiency of operation and safety, such as an additional series of internal cooling coils adapted to effectively prevent any "run-away" polymerization if the normal holding period has to be extended for some reason and an outer jacket for additional cooling or heating of the contents of the reactor.
  • the reaction zone can be operated so as to produce a liquid mixture with a polymer concentration or percent solids from as low as 30 percent to as high as 95 percent by weight and such polymer can possess a number average molecular weight ranging from 1000 to 6000.
  • the level of fillage of reactor 10 can vary from as low as 10 percent to as high as 100 percent, usable volume, and may be controlled by any desired means, for example, a level controller and associated valve or pump in the transfer line from reactor 10.
  • any desired means of controlling the temperature within reactor 10 may be employed. It is preferred that the temperature be controlled by circulation of a cooling fluid, such as oil, through internal cooling coils in those reactors so equipped such as reactors of the type illustrated.
  • a cooling fluid such as oil
  • the entry of relatively cool monomer composition serves to remove the greater proportion of the heat of polymerization released and the internal cooling coils serve to remove the remainder so as to control the temperature of the liquid mixture therein to a preselected value and thus produce a polymer of the desired degree of conversion and average molecular weight.
  • the residence time in the reaction zone can vary from 5 to 45 minutes.
  • devolatizer 14 is a stirred tank adapted to receive unreacted monomers and polymer product at atmospheric conditions.
  • the process of the present invention can be operated by the use of a single or multiple zones of devolatilization, as desired.
  • the vaporized monomers as well as any low oligomers thereof are removed from the devolatilization zone, liquefied in a condenser 16 and passed to a receiver 18. From the receiver a stream of the condensed monomers and oligomers can be recycled to recycle tank 20 and then to reactor 10 as shown.
  • the oligomers can be vaporized in the devolatilization zone and separated from the vaporized monomers prior to their condensation. Such oligomers can be separately recycled to a reaction zone or purged from the process.
  • the equipment for the present process is known to the art and has been described for use in other bulk polymerization procedures in U.S. Patent No. 3,968,059 and U.S. Patent 3,859,268.
  • the resin product pumped from the devolatizer 14 can be solidified by appropriate means or cut into an appropriate solvent system.
  • the resin product may be solidified by employing a conventional flaker.
  • the product flakes can be packaged in accordance with known techniques. For example, the flakes may be conducted to a flake bin by suction and then transported to a bagger.
  • a vertical stirred tank reactor of 1 gallon capacity adapted for cooling by oil was filled to 50% of its volume from a feed tank containing a mixture of 23 parts alpha-methylstyrene, 45 parts styrene and 32 parts acrylic acid and brought to a polymerization temperature of 272°C. Polymerization was begun with stirring and continued until the solids content of the liquid reaction mix reached about 90% solids. Thereafter, a feed rate of 21.77 kilograms per hour of the aforesaid monomer mixture per liter/3.75 of reactor was maintained and a residence time of 5 minutes was attained in the first reactor. The temperature of the polymerizing liquid in the first reactor was maintained at 272°C by circulating oil through the reactor jacket. A continuous withdrawal of polymer and monomer was established to maintain the initial level in the reactor.
  • a stirred devolatizer tank was filled with the effluent from the reactor to 10 -20% of its volume.
  • the temperature in the devolatized tank was maintained at 272°C. Vaporized monomers and oligomers were condensed and monomer mix was recycled to a recycle feed for delivery to the tank reactor.
  • a terpolymer product was recovered from the tank having a number average molecular weight of 2640, a weight average molecular weight of 4500, a dispersion index of 1.70 and an acid number of 190.
  • the terpolymer product was processed into flakes.
  • the flakes were processed into a 20% non-volatiles, resin cut according to conventional procedures.
  • the optical density of the resin cut was 0.1 at 400 nanometers (nm).
  • test runs were conducted in accordance with the procedure set forth in Example I.
  • the monomer charge, reaction temperature, T, (in °C), feed rate (kilograms/hour), residence time (R/T) (in minutes), number average molecular weight Mn of product, weight average molecular weight Mw of product, dispersion index Mw/Mn of product, and optical density, O.D., (log lo/I) of product were measured.
  • the results are set forth in Table 1.
  • reaction temperature is an important factor in the present process.
  • reaction temperatures are set below 235°C, the molecular weight of the polymer product is greater than 6000 and the dispersion index becomes greater than 2.
  • reaction temperatures rise above 310°C the molecular weight of the product is reduced to the high oligomer range and the optical density is severely compromised. The lower the value for optical density, the clearer the polymer product.
  • Example II In order to illustrate the effects of employing a solvent in the monomers mix, tests were run in accordance with the procedure of Example I. The quantity of solvent added to the monomers mix was varied between 5 and 20% by weight of total monomers mix. For illustrative purposes a test run is provided wherein no solvent was employed. The results are reported in Table 3. Mn is number average molecular weight and Mw is the weight average molecular weight. The acid number is the number of milligrams of potassium hydroxide required to neutralize one gram of the substance.
  • the polymers produced by the process of the invention can be employed in conventional floor finishing compositions, inks and the like. Other uses will be apparent to those with ordinary skill in this field.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Polymerisation Methods In General (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)

Claims (9)

1. Procédé de polymérisation en masse pour la préparation de polymères vinyliques de masse moléculaire faible ayant un indice de dispersion inférieur à 2 et une masse moléculaire moyenne en nombre de 1000 à 6000, comprenant les étapes qui consistent, en continu:
a) à charger un mélange de monomères vinyliques dans une zone réactionnelle agitée en continu contenant un mélange de résine en fusion comprenant des monomères vinyliques n'ayant pas réagi et lesdits polymères vinyliques;
b) à maintenir le mélange de résine en fusion à une température réactionnelle de 235°C à 310°C; et
c) à maintenir un débit dans ladite zone réactionnelle suffisant (1) pour fournir un temps de séjour dudit mélange de monomères vinyliques chargé dans ladite zone réactionnelle d'au moins 2 minutes afin de donner un produit de réaction; et (2) pour maintenir un niveau prédéterminé du mélange réactionnel dans ladite zone réactionnelle; ledit mélange de monomères vinyliques comprenant au moins un monomère aromatique monoalcénylique et au moins un monomère acrylique.
2. Procédé selon la revendication 1, dans lequel le monomère aromatique monoalcénylique constitute de 60 à 80% en poids et le monomère acrylique de 40 à 20% en poids.
3. Procédé selon la revendication 1, comprenant l'étape de séparation du produit de réaction copolymère des monomères n'ayant pas réagi et des sous-produits.
4. Procédé selon la revendication 2, dans lequel le monomère aromatique monoalcénylique est du styrène ou un mélange d'a-méthylstyrène et de styrène selon un rapport pondéral de 1:2 à 2:1, et le monomère acrylique est l'acide acrylique.
5. Procédé selon la revendication 1, 2, 3 ou 4, dans lequel le mélange de monomères vinyliques contient d'environ 1 à 10% en poids d'éther monoéthylique de diéthylène-glycol.
6. Procédé selon la revendication 1, 2, 3 ou 4, dans lequel la température réactionnelle est de 245°C à 275°C et le temps de séjour est de 5 à 45 minutes.
7. Polymères vinyliques en masse ayant un indice de dispersion inférieur à environ 2 et une masse moléculaire moyenne en nombre de 1000 à 6000, comprenant au moins un monomère aromatique monoalcénylique et au moins un monomère acrylique, les polymères vinyliques en masse étant préparés par chargement en continu d'un mélange de monomères vinyliques dans une zone réactionnelle agitée en continu contenant un mélange résinique en fusion de monomères vinyliques n'ayant pas réagi et desdits polymères vinyliques, le maintien du mélange résinique en fusion à une température réactionnelle de 235°C à 310°C, et le maintien d'un débit à travers la zone réactionnelle suffisant pour fournir un temps de séjour dudit mélange de monomères vinyliques chargé dans ladite zone réactionnelle d'au moins deux minutes afin de fournir un produit de réaction et de maintenir un niveau prédéterminé du mélange réactionnel dans ladite zone réactionnelle.
8. Polymères en masse selon la revendication 7, dans lesquels le monomère aromatique monoalcénylique est le styrène ou un mélange d'a-méthyistyrène et de styrène selon un rapport pondéral de 1:2 à 2:1, et le monomère acrylique est l'acide acrylique.
9. Polymères en masse selon la revendication 7 ou 8, dans lesquels le mélange de monomères vinyliques contient de 1 à 10% en poids d'éther monoéthylique de diéthylène-glycol.
EP82900690A 1981-01-09 1982-01-07 Procede de copolymerisation en vrac continue de monomeres vyniliques Expired - Lifetime EP0068024B2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82900690T ATE33254T1 (de) 1981-01-09 1982-01-07 Verfahren zur kontinuierlichen massenkopolymerisation von vinylmonomeren und erhaltenes produkt.

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US22359781A 1981-01-09 1981-01-09
PCT/US1982/000010 WO1982002387A1 (fr) 1981-01-09 1982-01-07 Procede de copolymerisation en vrac continue de monomeres vyniliques et produit obtenu par ce procede
US223597 1998-12-30

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EP0068024A1 EP0068024A1 (fr) 1983-01-05
EP0068024B1 true EP0068024B1 (fr) 1988-03-30
EP0068024B2 EP0068024B2 (fr) 1996-02-07

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CA (1) CA1214598A (fr)
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WO (1) WO1982002387A1 (fr)

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EP3170552A1 (fr) 2015-11-23 2017-05-24 Basf Se Microcapsule comprenant une enveloppe polymère et un matériau de noyau hydrophile ou hydrophobe
MX2022001223A (es) 2019-07-29 2022-03-02 Basf Coatings Gmbh Composiciones de recubrimiento que contienen resinas (met)acrilicas que tienen grupos silano.
US20230140735A1 (en) 2020-04-01 2023-05-04 Covestro (Netherlands) B.V. Process for Preparing Aqueous Polymer Dispersions

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EP0068024B2 (fr) 1996-02-07
EP0068024A1 (fr) 1983-01-05
CA1214598A (fr) 1986-11-25
WO1982002387A1 (fr) 1982-07-22
DE3278283D1 (en) 1988-05-05

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